package com.jd.fms.common.ws;

import com.jd.common.util.HexUtil;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

/**
 * **************************************************
 *
 * @author sunbingwei@360buy.com
 *         date: Feb 23, 2011
 *         <p/>
 *         ***************************************************
 */
public class MD5Util {
    private MD5Util() {
    }

    /**
     * Returns a MessageDigest for the given <code>algorithm</code>.
     * <p/>
     * <p/>
     * The MessageDigest algorithm name.
     *
     * @return An MD5 digest instance.
     * @throws RuntimeException when a {@link java.security.NoSuchAlgorithmException} is
     *                          caught
     */

    static MessageDigest getDigest() {
        try {
            return MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }

    /**
     * Calculates the MD5 digest and returns the value as a 16 element
     * <code>byte[]</code>.
     *
     * @param data Data to digest
     * @return MD5 digest
     */
    public static byte[] md5(byte[] data) {
        return getDigest().digest(data);
    }

    /**
     * Calculates the MD5 digest and returns the value as a 16 element
     * <code>byte[]</code>.
     *
     * @param data Data to digest
     * @return MD5 digest
     */
    public static byte[] md5(String data) {
        return md5(data.getBytes());
    }

    /**
     * Calculates the MD5 digest and returns the value as a 32 character hex
     * string.
     *
     * @param data Data to digest
     * @return MD5 digest as a hex string
     */
    public static String md5Hex(byte[] data) {
        return HexUtil.toHexString(md5(data));
    }

    /**
     * Calculates the MD5 digest and returns the value as a 32 character hex
     * string.
     *
     * @param data Data to digest
     * @return MD5 digest as a hex string
     */
    public static String md5Hex(String data) {
	        return HexUtil.toHexString(md5(data));
	    }
}
